scutum

Paired plate or valve of thoracic Cirripedia; in lepadomorphs, 1 on each side of occludent margin of capitulum. In verrucomorphs, of two types: fixed scutum, 1 of 4 compartmental plates; movable scutum, 1 of 2 opercular plates [McLaughlin, 1980].

Valve of cirriped shell opposite carina and adjacent to peduncle in some forms (Lepadomorpha) or opercular in others (Balanomorpha). (Pl. scuta) [Moore and McCormick, 1969].

(Subclass Cirripedia):

() [Anderson, 1980].

^{Lepas anatifera: left valve removed. [Anderson, 1980]}

(Subclass Cirripedia):

() [Anderson, 1980].

^{Lepas anatifera: rostral view; and left valve and cirri removed. [Anderson, 1980]}

(Subclass Cirripedia):

() [Anderson, 1980].

^{Balanus trigonus: apical view; left lateral view; and operculum, body, and branchiae. [Anderson, 1980]}

(Subclass Cirripedia):

() [Anderson, 1980].

^{Balanus trigonus: wall plates, exploded; and interior of operculum. [Anderson, 1980]}

(Subclass Cirripedia):

One of five primary plates (carina, two scuta, two terga) on outer surface of barnacle. Paired, one scutum located on each side of aperture. In unstalked barnacle, variously associated with tergum to form operculum. Features of scutum include angles (basioccludent, basitergal), apex, articular furrow, margins (basal, occludent, tergal, tergolateral), and ridges (apicobasal, apicoumbonal, articular). Bears markings (muscle pits) of muscle attachments on inner surface. (rhomboidal, triangular, split/not split into two parts) [Stachowitsch, 1992].